Background: The Blue bull (Boselaphus tragocamelus) is regarded as one of the biggest antelopes in Asia and safeguarded beneath the IUCN since 2003 and under safeguard of 'Schedule III' of the Indian Wildlife Protection Act, 1972. This study focused on the detailed gross morphometrical study of mid thoracic ribs of Blue Bull (Boselaphus tragocamelus).Methods: The present study was carried out on the skull of six specimens of adult Blue bull (Boselaphus tragocamelus) of either sex. The measurements of various parameters of skull bones were taken with the help of weighing machine, thread, scale and digital Vernier's calliper.Result: The average length of skull was found to be 40.9 +/- 1.08 cm in female, which was significantly less (P<0.05) than that of males, where it was recorded as 49.5 +/- 097 cm. Similarly, the average facial length was found to be 16.6 +/- 0.20 cm in female, which was significantly less (P<0.05) than that of males, where it was recorded as 22.0 +/- 0.17 cm. The average left cranio-caudal length of tympanic bulla was found to be 4.1 +/- 0.15 cm in female, which was significantly less (P<0.05) than that of males, where it was recorded as 4.5 +/- 0.19 cm. The average length of left zygomatic process of squamous temporal bone was found to be 5.7 +/- 0.11 cm in female, which was significantly less (P<0.05) than that of males, where it was recorded as 7.1 +/- 0.08 cm. The average distance between the last incisor and first premolar teeth was found to be 6.3 +/- 0.12 cm in female, which was significantly less (P<0.05) than that of males, where it was recorded as 8.2 +/- 0.17 cm.
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